%0 Journal Article
%T Influence of Methacrylic-Acrylic Copolymer Composition on Plasticiser-free Optode Films for pH Sensors
%A Lee Yook Heng
%A Teh Huey Fang
%A Loh Han Chern
%A Musa Ahmad
%J Sensors
%D 2003
%I MDPI AG
%R 10.3390/s30400083
%X In this work we have examined the use of plasticiser-free polymeric films incorporating a proton selective chromoionophore for optical pH sensor. Four types of methacrylic-acrylic copolymers containing different compositions of n-butyl acrylate (nBA) and methyl methacrylate (MMA) were synthesised for use as optical sensor films. The copolymers were mixed with appropriate amounts of chromoionophore (ETH5294) and a lipophilic salt before spin coated on glass slides to form films for the evaluation of pH response using spectrophotometry. Co-polymer films with high nBA content gave good response and the response time depended on the film thickness. A preliminary evaluation of the optical films of high nBA content with pHs from 2 - 14 showed distinguishable responses from pH 5 - 9. However, the adhesion of the pH sensitive film was good for copolymers with higher content of MMA but not for films with high nBA.
%K Optical pH sensor
%K Methacrylic-acrylic films
%K Chromoionophore
%K Plasticiserfree
%U http://www.mdpi.com/1424-8220/3/4/83